TermSocket variable _log conflicts with tornado.RequestHandler._log

[mgmarino]

I am using tornado version 4.2 and terminado 0.5.

TermSocket defines the variable _log defined here which conflicts with tornado.RequestHandler._log defined here.

This causes an error for example when a class derived from TermSocket throws an exception in get, e.g.:

class TermSocket(terminado.TermSocket):
    def get(self, *args, **kwargs):
        throw web.HTTPError(404)

Stack trace:

ERROR:tornado.application:Exception in exception handler
Traceback (most recent call last):
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/tornado/web.py", line 1422, in _execute
    self._handle_request_exception(e)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/tornado/web.py", line 1476, in _handle_request_exception
    self.send_error(500, exc_info=sys.exc_info())
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/tornado/websocket.py", line 371, in send_error
    super(WebSocketHandler, self).send_error(*args, **kwargs)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/tornado/web.py", line 980, in send_error
    self.finish()
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/tornado/websocket.py", line 389, in _disallow_for_websocket
    method(self, *args, **kwargs)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/tornado/web.py", line 936, in finish
    self._log()
TypeError: 'Logger' object is not callable

It is noted in the tornado code that this function is 'somewhat' deprecated. Probably the simplest solution since _log is only used locally is to change the name.